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Abstract:

The numerical study explores the augmentation of heat dissipation rate and efficiency of a counter flow heat exchanger (CFHEx) in the presence of (MWCNT/ZnO) hybrid nanofluids (HNF). The HNF concentration is varied from 0.01% to 0.05% in steps of 0.02%. The Reynolds number (Re) of cold fluid is varied from 2436 to 11626, while that of hot fluid, Re, is kept constant. The typical k-ɛ model is utilized for the numerical simulation in turbulent flow regimes. The current numerical results are compared to the literature to serve as validation purpose. From the validation study, the Nusselt (Nu) number agrees well with the numerical and experimental data of the literature, with a deviation of less than 6%. From the numerical study, it can be observed that when the concentrations of HNF the Nu number intensifies meaningfully with a rise in the Re number. For HNF concentration of 0.05%, the average increase in Nusselt number (Nu) is found to be around 41.35% and 23.13% higher than that of base fluid water and 0.01% concentration of HNF, respectively, with an adequate rise in the pressure drop. The critical performance evaluation criteria are also determined, and it is found that at higher concentrations, of hybrid nanofluid performs better than at lower concentrations of the hybrid nanofluid. In addition, the PEC is found to be maximum at lower Re numbers, and further, it reduces with an increase in the flow Re number.

Keywords:

Friction factor,Heat Exchanger,Hybrid nanofluid,Nusselt number,Performance evaluation criteria,

Refference:

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IV. A. Mund, B. Pattanayak, J. S. Jayakumar, K. Parashar, S. K. S. Parashar. : ‘Experimental and Numerical Study of Heat Transfer in Double-Pipe Heat Water Nanofluid’. Advances in Fluid and Thermal Engineering. Vol. 1, pp. 531-540, 2019. 10.1007/978-981-13-6416-7.
V. A. P. Sudheer, U. Madanan. : ‘Numerical investigation into heat transfer augmentation in a square minichannel heat sink using butterfly inserts’. Thermal Science and Engineering Progress. Vol. 36, pp. 101522, 2022. 10.1016/j.tsep.2022.101522.
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VIII. G. Narendran, P. H. Jadhav, N. Gnanasekaran. : ‘Numerical analysis of thermo hydro-dynamics behavior of solar flat plate collector with square and V-cut twisted tape inserts’. Numerical Heat Transfer, Part A: Applications. Vol. 84, pp. 1-25, 2023. 10.1080/10407782.2023.2294043.
IX. G. S. Reddy, R. Kalaivanan, R. U. Kumar, P. H. Jadhav. : ‘Influence of W-cut twisted tape inserts on heat transfer characteristics of a counter flow heat exchanger using CeO2 nanofluid – an experimental and numerical investigations’. Numerical Heat Transfer, Part A: Applications. Vol. 85, pp. 1-21, 2024. 10.1080/10407782.2024.2359060.
X. H. Maddah, M. Alizadeh, N. Ghasemi, S. R. Wan Alwi. : ‘Experimental study of Al2O3/water nanofluid turbulent heat transfer enhancement in the horizontal double pipes fitted with modified twisted tapes’. International Journal of Heat and Mass Transfer. Vol. 78, pp. 1042-1054, 2014. 10.1016/j.ijheatmasstransfer.2014.07.059.
XI. K. Aroonrat, C. Jumpholkul, R. Leelaprachakul, A. S. Dalkilic, O. Mahian, S. Wongwises. : ‘Heat transfer and single-phase flow in internally grooved tubes’. International Communications in Heat and Mass Transfer. Vol. 42, pp. 62-68, 2013. 10.1016/j.icheatmasstransfer.2012.12.001.
XII. M. E. Nakhchi, J. A. Esfahani. : ‘Numerical investigation of rectangular-cut twisted tape insert on performance improvement of heat exchangers’. International Journal of Thermal Sciences. Vol. 138, pp. 75-83, 2019. 10.1016/j.ijthermalsci.2018.12.039.
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XVII. M. M. Rahman, S. Saha, S. Mojumder, A. G. Naim, R. Saidur, T. A. Ibrahim. : ‘Effect of Sine-Squared Thermal Boundary Condition on Augmentation of Heat Transfer in a Triangular Solar Collector Filled with Different Nanofluids’. Numerical Heat Transfer, Part B: Fundamentals. Vol. 68, pp. 37-41, 2015. 10.1080/10407790.2014.992058.
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XXI. P. H. Jadhav, N. Gnanasekaran, D. A. Perumal, M. Mobedi. : ‘Performance evaluation of partially filled high porosity metal foam configurations in a pipe’. Applied Thermal Engineering. Vol. 194, pp. 117081, 2021. 10.1016/j.applthermaleng.2021.117081.
XXII. P. H. Jadhav, N. Gnanasekaran, M. Mobedi. : ‘Analysis of functionally graded metal foams for the accomplishment of heat transfer enhancement under partially filled condition in a heat exchanger’. Energy. Vol. 263, pp. 125691, 2023. 10.1016/j.energy.2022.125691.
XXIII. P. H. Jadhav, G. Nagarajan, D. A. Perumal. : ‘Conjugate heat transfer study comprising the effect of thermal conductivity and irreversibility in a pipe filled with metallic foams’. Heat and Mass Transfer. Vol. 57, pp. 911-930, 2020. 10.1007/s00231-020-03000-x.
XXIV. P. H .Jadhav, N. Gnanasekaran, D. A. Perumal. : ‘Numerical consideration of LTNE and Darcy extended Forchheimer models for the analysis of forced convection in a horizontal pipe in the presence of metal foam’. Journal of Heat Transfer. Vol. 143, pp. 1-16, 2021. 10.1115/1.4048622.
XXV. P. H. Jadhav, T. G, N. Gnanasekaran, M. Mobedi. :’ Performance score based mulri-objective optimization for thermal dasign of partially filled high porosity metal foam pipes under forced convection’. International Journal of Heat and Mass Transfer. Vol. 182, pp. 121911, 2022. 10.1016/j.ijheatmasstransfer.2021.121911.
XXVI. P. H. Jadhav, N. Gnanasekaran, D. A. Perumal. : ‘Thermodynamic analysis of entropy generation in a horizontal pipe filled with high porosity metal foams’. Materials Today: Proceedings. Vol. 51, pp. 1598 – 1603, 2022. 10.1016/j.matpr.2021.10.451.
XXVII. P. H. Jadhav, B. Kotresha, N. Gnanasekaran, D. Arumuga Perumal. : ‘Forced Convection Analysis in a Horizontal Pipe in the Presence of Aluminium Metal Foam-A Numerical Study’. Springer Singapore. pp. 1-15, 2021. 10.1007/978-981-16-0698-4_53.
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XXIX. P. V. D. Prasad, A. V. S. S. K. S. Gupta, K. Deepak. : ‘Investigation of Trapezoidal-Cut Twisted Tape Insert in a Double Pipe U-Tube Heat Exchanger using Al2O3 / Water Nanofluid’. Procedia Materials Science. Vol. 10, pp. 50-63, 2015. 10.1016/j.mspro.2015.06.025.

XXX. R. Aghayari, H. Maddah, S. M. Pourkiaei, M. H. Ahmadi, L. Chen, M. Ghazvini. : ‘Theoretical and experimental studies of heat transfer in a double-pipe heat exchanger equipped with twisted tape and nanofluid’. The European Physical Journal Plus. Vol. 135, pp. 123, 2020. 10.1140/epjp/s13360-020-00252-8.
XXXI. R. Dakota, P. Gregory, K. H. Stefania, I. M. Ziad. : ‘Experimental and numerical investigation of heat enhancement using a hybrid nanofluid of copper oxide / alumina nanoparticles in water’. Journal of Thermal Analysis and Calorimetry. Vol. 143, pp. 1-15, 2020. 10.1007/s10973-020-09639-2.
XXXII. R. Khargotra, R. Kumar, R. Nadda, S. Dhingra, T. Alam. : ‘A review of different twisted tape configurations used in heat exchanger and their impact on thermal performance of the system’. Heliyon. Vol. 9, pp. e16390, 2023. 10.1016/j.heliyon.2023.e16390.
XXXIII. S. Kr, S. Jahar. : ‘Improving hydrothermal performance of double-tube heat exchanger with modified twisted tape inserts using hybrid nanofluid’. Journal of Thermal Analysis and Calorimetry. Vol. 143, pp. 1-15, 2020. 10.1007/s10973-020-09380-w.
XXXIV. S. R. Goda, R. Kalaivanan, R. U. Kumar, P. H. Jadhav. : ‘Experimental and numerical investigation of thermo-hydrodynamic performance of twin tube counter flow heat exchanger using cerium oxide nanofluid’. Numerical Heat Transfer, Part A: Applications. Vol. 84, pp. 1-19, 2023. 10.1080/10407782.2023.2268831.
XXXV. T. S. Athith, G. Trilok, P. H. Jadhav, N. Gnanasekarn. : ‘Heat transfer optimization using genetic algorithm and artificial neural network in a heat exchanger with partially filled different high porosity metal foam. Material Toady: Proceedings. Vol. 51, pp. 1642-1648, 2022. 10.1016/j.matpr.2021.11.248.
XXXVI. W. Ahmed, S. N. K. Z. Z. Chowdhury, M. R. B. J. Naveed, A. M. A. Mujtaba. : ‘Experimental investigation of convective heat transfer growth on ZnO@TiO2/DW binary composites / hybrid nanofluids in a circular heat exchanger’. Journal of Thermal Analysis and Calorimetry. Vol. 143, pp. 1-15, 2020. 10.1007/s10973-020-09363-x.
XXXVII. W. Li, Z. Yu, Y. Wang, Y. Li. : ‘Heat transfer enhancement of twisted tape inserts in supercritical carbon dioxide flow conditions based on CFD and vortex kinematics’. Thermal Science and Engineering Progress. Vol. 31, pp. 101285, 2022. 10.1016/j.tsep.2022.101285.

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Abstract:

This paper presents a comprehensive analysis of a feedback queue model with a Priority mechanism and investigates its behavior under stochastic conditions. This model comprises two serially connected service channels, with priority applied exclusively to the first service channel. Upon entry, customers are classified into two groups-low and high priority. A preemptive priority discipline is used at the first server to distinguish between high- and low-priority customers, thereby reflecting real-world service hierarchies. The feedback mechanism in the model allows for a maximum of one time only for the customer’s satisfaction with the service. The arrival of the customers is governed by a Poisson process and and service times at both servers are assumed to follow independently and be exponentially distributed. Upon service completion at the second server, customers may either exit the system permanently or re-enter the network through a feedback loop. The Steady-state behavior of the system is captured through a set of differential equations, which are solved by using the generating function technique combined with classical calculus laws. Various queue performance indicators, including average queue length, variance in queues, server utilization, and total duration time, are discussed. In the last section, a comparative study of the model with the literature is also discussed. The model’s behaviour is well demonstrated both graphically and numerically and provides an in-depth understanding of how each parameter influences the overall system performance, and the obtained results prove the stability and accuracy of the model. The insights derived from the analysis could help understand the design and optimization of the queueing model in different settings such as hospitals, manufacturing industries, and telecommunications.

Keywords:

Feedback,Generating function techniques,Priority,Queueing,Serial Channel,Stochastic condition,

Refference:

I. Ajewole, O. R., C. O. Mmduakor, E. O. Adeyefa, J. O. Okoro, and T. O. Ogunlade. “Preemptive-Resume Priority Queue System with Erlang Service Distribution.” Journal of Theoretical and Applied Information Technology, vol. 99, no. 6, 2021, pp. 1426–1434.
II. Agarwal, A., R. Agarwal, and S. Upadhyaya. “Detection of Optimal Working Vacation Service Rate for Retrial Priority G-Queue with Immediate Bernoulli Feedback.” Results in Control and Optimization, vol. 14, 2024, p. 100397. 10.1016/j.rico.2024.100397.
III. Dudin, A., O. Dudina, S. Dudin, and K. Samouylov. “Analysis of Single-Server Multi-Class Queue with Unreliable Service, Batch Correlated Arrivals, Customer’s Impatience and Dynamical Change of Priorities.” Mathematics, vol. 9, no. 1257, 2021, pp. 1–17. 10.3390/math9111257.
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XV. Saini, A., D. Gupta, and A. K. Tripathi. “Analytical Study of Two Serial Channels with Priority and Reneging.” International Journal on Recent and Innovation Trends in Computing and Communication, vol. 11, no. 6, 2023, pp. 89–93. 10.17762/ijritcc.v11i6.7237.
XVI. Saini, V., D. Gupta, and A. K. Tripathi. “Analysis of Feedback Queue System Comprised of Two Serial Servers with Impatient Customers.” Aryabhatta Journal of Mathematics and Informatics, vol. 14, no. 2, 2022, pp. 145–152.
XVII. Sangeeta, S., M. Singh, and D. Gupta. “Analysis of Serial Queues with Discouragement, Reneging and Feedback.” AIP Conference Proceedings, vol. 2735, no. 1, 2023. 10.1063/12.0016682.
XVIII. Shree, V., S. Upadhyaya, and R. Kulshrestha. “Cost Scrutiny of Discrete-Time Priority Queue with Cluster Arrival and Bernoulli Feedback.” OPSEARCH, 2024, pp. 1–34. 10.1007/s12597-024-00742-8.
XIX. Singh, T. P. “Steady State Analysis of Heterogeneous Feedback Queue Model.” Proceedings of International Conference on Intelligence System and Network (ISTK), 2011.
XX. Singh, T. P., and A. Tyagi. “Cost Analysis of a Queue System with Impatient Customer.” Aryabhatta Journal of Mathematics and Informatics, vol. 6, no. 2, 2013, pp. 309–312.
XXI. Xu, J., and L. Liu. “Analysis of a Two-Stage Tandem Queuing System with Priority and Clearing Service in the Second Stage.” Mathematics, vol. 12, no. 10, 2024, p. 1500. 10.3390/math121015.
XXII. Zadeh, A. B. “A Batch Arrival Multi-Phase Queueing System with Random Feedback in Service and Single Vacation Policy.” OPSEARCH, vol. 52, 2015, pp. 617–630. 10.1007/s12597-015-0206-9

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Abstract:

A novel closed-type modified anti-Gaussian 4-point transformed rule has been developed for solving Cauchy principal value complex integrals. Furthermore, a more precise mixed quadrature rule MQ(f), has been created by combining the closed-type modified quadrature rule with the Gauss-Legendre 2-point transformed technique. Theoretical analysis of errors confirms the enhanced performance of the newly proposed quadrature rule. Numerical computation of various sample integrals is performed. The numerical calculations demonstrate the superiority of the new rule among others.

Keywords:

Cauchy principal value integrals,Gauss-Legendre transformed rule,closed-type anti-Gaussian transformed rule,mixed rule,singularity,

Refference:

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https://www.researchgate.net/publication/308750557_An_Open_type_Mixed_Quadrature_Rule_using_Fejer_and_Gaussian_Quadrature_Rules
III. D. K. Behera, D. Das and R. B. Dash, “On the Evaluation of Integrals of Analytic Functions in Adaptive Integration Scheme”, Bulletin of the Cal. Math. Soc.,Volume : 109, Issue : 3,2017, pp : 217-228.
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XIII. R. N. Das and M. K. Hota, “A Derivative Free Quadrature Rule for Numerical Approximations of Complex Cauchy Principal Value of Integrals”, Applied Mathematical Sciences, Volume : 6, Issue : 111, 2012,pp : 5533-5540.
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XVIII. T. Singh, D. K. Behera, R.K. Saeed and S. A. Edalatpanah, “A novel quadrature rule for integration of analytic functions”, Journal of mechanics of continua and mathematical sciences,Volume : 20, Issue : 2, 2025, pp : 28 – 38. 10.26782/jmcms.2025.02.00003

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Abstract:

Container-based virtualization has become prominent as lightweight virtualization due to its scalability, resource utilization, and portability, especially in microservices. Container scheduler plays an essential role in Container services to optimize performance to reduce the overall cost by managing load balancing. However, scheduling Containers with efficiency while ensuring the Container security remains one of the major challenges. This paper presents a hybrid scheduling approach by combining a nature-inspired algorithm with the security principle. Our proposed technique combines the optimization of the Intelligent Water Drop (IWD) algorithm with Anti-Collocation and Security Affinity Rules (ACAR) to ensure the privacy of Containers. IWD-ACAR focuses on resource optimization, and one of the security concerns is that no more than two Containers should be placed on the less secure node. To simulate the proposed technique, we have used Python, and the simulation results demonstrate 25% improvement in the resource utilization along with a 98% threat detection rate in real-time monitoring. The proposed approach balances the various performance evaluation parameters like CPU utilization, memory utilization, along security in a cloud environment.

Keywords:

Cloud Computing,Containerization,Isolation,Resource allocation,Scheduling,Security,

Refference:

I. Bachiega, Naylor G., Paulo S. L. de Souza, Sarita M. Bruschi, and Simone do R. S. de Souza. “Container-Based Performance Evaluation: A Survey and Challenges.” 2018 IEEE International Conference on Cloud Engineering (IC2E), IEEE, April 2018, pp. 398–403. 10.1109/IC2E.2018.00075.
II. Rathi, Sugandha, Renuka Nagpal, Gautam Srivastava, and Deepti Mehrotra. “A Multi-Objective Fitness Dependent Optimizer for Workflow Scheduling.” Applied Soft Computing, vol. 152, 2024, article 111247. 10.1016/j.asoc.2024.111247. jscca.uotechnology.edu.iq+7dl.acm.org+7ouci.dntb.gov.ua+7
III. Li, Jun, Peng Wang, and Yan Zhang. “A Survey on Scheduling Algorithms in Cloud Computing.” Journal of Cloud Computing, vol. 10, no. 1, 2021, pp. 1–20. 10.3233/MGS-220217. journals.sagepub.com+2dl.acm.org+2researchgate.net+2
IV. Jeon, Jueun, et al. “Efficient container scheduling with hybrid deep learning model for improved service reliability in cloud computing.” IEEE Access (2024). 10.1109/ACCESS.2024.3396652
V. Tabrizchi, Hamed, and Marjan Kuchaki Rafsanjani. “A survey on security challenges in cloud computing: issues, threats, and solutions.” The journal of supercomputing 76.12 (2020): 9493-9532. 10.1007/s11227-020-03213-1
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Abstract:

The Article describes the kinetic approach to ethanol and ethyl acetate combustion using a Mn-Cu catalyst. Catalytic combustion is an established process for removing volatile organic compounds. Acetaldehyde is an intermediate product of ethanol oxidation. The kinetic mechanism of this model is expressed in terms of a nonlinear equation in planar coordinates. Approximate analytical solutions for the concentrations of ethanol, ethyl acetate, and acetaldehyde are derived using asymptotic methods. Analytical results are verified to be accurate through a direct comparison with numerical simulation. This paper aims to provide a kinetic evaluation of the combustion of ethanol over a Mn-Cu catalyst. The study was conducted to estimate the appropriate kinetic parameters and formulate reasonable reaction rate expressions.

Keywords:

Catalytic Combustion,Mathematical modeling,Nonlinear differential equations,

Refference:

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